Dyeing and pkinting process



Patented A r. 30, 1929.

UNITED STATES PATENT OFFICE.

ALFRED THAUSS, OF COLOGNE-DEUTZ, AND ALFRED GUENTHER, OF GOLOGNEBIEHD,GERMANY, ASSIGNORS TO GRASSELLI DYESTUFF CORPORATION, OF NEW YORK,

N. Y., A CORPORATION 01 DELAWARE.

DYEING AND PRINTING IROCESS.

No Drawing. Application. filed November 10, 1927, Serial No. 232,465,and in Germany December 3,1926.

The present invention concerns the dyeing and printing of mixed fabricscontaining wool and silk with dyestuffs to be employed in acid orneutral baths and consists in the use of a sulfonation product obtainedfrom resins. J

In accordance with the present invention said mixed fabrics aresubjected to a preliminary treatment with resins. as for examplecolophony, which have been rendered soluble by means of sulfuric acid.The sulfonated resins behave in a like manner to that of sulfonatedphenols, for example, and operate to reduce or prevent the absorption ofdyestufis by wool and silk.

In some instances the addition of tin salts materially assists inobtaining the desired results.

The following examples will illustrate our invention a Example 1.-Acotton material containing shoddy, which has been dyed fairly dark is tobe dyed a most vivid marine blue color. The shoddy is first subjected toa preliminary dyeing in an acid bath with most vivld dyestuffs, such asfor example patent blue, alkali fast green, acid violet 4 B extra, thematerial is then rinsed and covered with a cotton dyestufi with theaddition of the customary amount of Glauber salt and 3% of colophonysulfonic acid at a temperature of about SO-60 0. According to the depthof the shade desired the dyeing can be effected with bright or blackcotton dyestuffs. The addi tion of the colophony sulfonic acid reventsthe absorption of the cotton dyestu by the shoddy whilst at the sametime a much more vivid dyeing is obtained than is the case in theabsence of colophony sulfonic acid.

Example 2.-In a wool material containing threads of artificial silk forproducing certain efIects, the wool is subjected to a preliminary dyeingin an acid bath with the dyestufi obtained from benzaldehyde and ethylbenzyl metatoluidine sulfonic acid; then the artificial silk is coveredin a tepid bath with 4% of the azo-dyestufl frombenzidine-fl-naphthylamino -5 :7 disulfonic acid and2-arnino-5'naphthol-7-sulfonic acid with the addition of of colophonysulfonic dyestuffs to be employed in acid or neutral acid. lhe two-foldcolor effect thus obtained is considerably more beautiful than would bethe case without the addition of colophony sulfonic acid.

Erample 3.So-called half silk material, which is composed of silk andcotton is dyed with the same dycstufls and in a similar mannor asdescribed in Example 2. In this case also a far greater contrast effectis obtained than would be the case without the use of colophony sulfonicacid.

lVe claim:

1. In the process of dyeing and printing of mixed fabrics containinganimal fibres with dyestuffs to be employed in acid or neutral baths,the step which comprises the use of a sulfonation product obtainablefrom resins.

2. In the process of dyeing and printing of mixed fabricscontaining-animal fibres with baths, the step which comprises the use ofcolophony sulfonic acid.

3. In the process of dyeing and printing of mixed fabrics containinganimal fibres with dyestuffs to be employed in acid or new tral baths,the step which comprises the use of, a sulfonation product obtainablefrom resins with the addition of tin salt.

4. In the process of dyeing and printing of mixed fabrics containinganimal fibres with dyestuffs to be employed in acid or neutral baths,the step which comprises the use of colophony sulfonic acid with theaddition of tin salt.

5. In the process of reducing the absorptive power of animal fibres foracid or neutral dyeing dyestuffs the step which comprises adding asulfonation product obtainable from resins to the dyebath.

6. In the process of reducing the absorptive power of animal fibres foracid or neutral dyeing dyestufis the step which comprises fiddlingcolophony sulfonic acid to the dye- 7. In the process of reducing theabsorptive power of animal fibres for acid or neutral dyeing dyestufisthe step which comprises addlng a sulfonation product obtainable fromresins to the dyebath with the addition of tin salt.

8. In the process of reducing the absorp- 1.0. The fibre treated withdyestuffs and two power of animal fibres for nc1d or new snlfonutionproducts obtalnable from resins trail dyeing dyestufls the step whichconiand tin salt. 1 10 prises adding colophony sulfonic acid to the Intestimony whereof We have hereunto set 5 dyebath with the addition oftin salt. our hands.

9. The fibre treated with dyestuffs and sul- ALFRED THAUSS.

fonation products obtainable from resins. ALFRED GUENTHER.

